Many wireless hidden camera clock products like the Neolavish hidden camera clock have built-in motion detection system. But, how does this feature actually work? Let’s find out in this brief yet insightful article about motion security sensors.
What are motion sensors?
Before we dive into more technical stuff, we need to know what is the purpose of motion sensor first. From its name, it detects movement. For instance, if there is a burglar in your home, it will pick up the activity, and, depending on your system and its settings, it can automatically activate other security features of your device such as an alarm, camera recording, push notification, or all of the above. This feature is common in smart gadgets like security cameras, alarms, and doorbells.
How motion sensors work?
So, how can it detect motion? A motion sensor can be either optical or acoustic. Optical meaning visual and acoustic meaning sound. A sensor also comes with a transmitter. Some sensors can detect movement through the moving object’s reflection. Let’s say you’ve installed a light sensor on your driveway. If the sensor picks-up your movement through reflection, it will trigger the light to power on. After you’ve presumably left the sensor range, it will signal the light to turn off.
What are the different types of motion sensors?
- Passive Infrared (PIR) – This sensor relies on your body heat or temperature to detect movement, but it doesn’t emit any energy. Its non-emission of energy makes it different from electric eye sensors which sense movement when its infrared beam is interrupted – like blocked.
- Microwave – Microwave, on the other hand, uses an electromagnetic field to have an invisible detection zone. It continually emits microwave signals or pulses to detect motion. It usually comes with a transmitter and receiver to work.
- Ultrasonic – Just like bats, ultrasonic sensors rely on echo for motion detection.
- Tomographic – With tomographic you have to install nodes throughout the entire area you want to monitor. This type of sensor emits radio waves, which can pass through walls and still or moving objects.
- Dual/combined – Modern security sensors today combine two or more types of sensors to prevent false tripping, and ensure if one sensor fails, others will stay operational.